Wuhan Institute of Geology and Minerals Resources

Wuhan, China

Wuhan Institute of Geology and Minerals Resources

Wuhan, China
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Guo C.,Chinese Academy of Geological Sciences | Zeng L.,Chinese Academy of Geological Sciences | Li Q.,CAS Institute of Geology and Geophysics | Fu J.,Wuhan Institute of Geology and Minerals Resources | Ding T.,Chinese Academy of Geological Sciences
Lithos | Year: 2016

Fayalite-bearing felsic (FBF) magmatic rocks are a special type of granitic rocks with controversial origins. A suite of fayalite- and ferrosilite-bearing subvolcanic rocks, namely, the Xishan FBF rocks in South China, is investigated in this study. The Xishan FBF rocks have high SiO2 contents of 69–70 wt.%, high K2O/Na2O ratios of 1.71–1.95, and high FeOt/(FeOt + MgO) ratios of 0.88–0.89. Fayalite (Fo = 7.3–9.6) and ferrosilite (Fs = 74.1–76.5) minerals are found in the Xishan FBF rocks. According to the Unmix function of Isoplot, the zircon U–Pb ages and initial Hf isotope compositions are categorized into two groups with ages of 156.6 Ma and 151.5 Ma and εHf(t) values of − 7.1 and − 5.2, respectively. The minerals show δ18O values of 8.8–9.8‰ for zircon, 6.0–8.1‰ for fayalite, and 7.0–8.2‰ for ferrosilite. The oxygen isotope fractionations between ferrosilite and fayalite (ΔOpx-Ol) vary from − 0.8‰ to + 1.5‰, which indicates disequilibrium crystallization. Whole-rock analyses show high initial 87Sr/86Sr ratios of 0.7169 to 0.7180 and negative εNd(t) values of − 7.3 to − 6.8; zircon analyses show εHf(t) values of − 9.1 to − 3.8 and δ18O values of 8.8–9.8‰. So whole rock and zircon isotopes indicate a crustal signature. Based on these mineralogical and geochemical data, the Xishan FBF rocks were attributed to A-type granites and derived from the mixing of two batches of crustal magmas, which were all derived from the partial melting of ancient igneous protolith under the conditions of high temperature (683–893 °C), moderate water (3–5 wt.%), and low oxygen fugacity (lg fO2 = − 1.21). Such rigorous physical conditions may be common for the FBF igneous rocks all over the world, which may be the primary factors controlling occurrence of the FBF rocks in limited volume and quantity. © 2016 Elsevier B.V.

Zhang K.,Wuhan University | Pan G.,Chengdu Institute of Geology and Minerals Resources | He W.,Wuhan University | Xiao Q.,China Geological Survey | And 14 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2015

As a whole, the continent of China is grouped by Pan-Cathaysian blocks, Laurasia and Gondwana continental margins and 3 oceans (Paleo-Asian Ocean, Tethys Ocean and Pacific Ocean). In detail, the continent of China is grew up by 3 blocks or platforms (North China, Tarim and Yangtze) and 8 orogenic belts (Altai-Inner Mongolia-Daxinganling, Tianshan-Junggar-Beishan, Qinling-Qilian-Kunlun, Qiangtang-Sanjiang, Gangdisê, Himalaya, Cathaysia, Eastern Taiwan) during the process of disappearing of oceanic crusts and the colliding-growing of continental crusts. In the orogenic belts, 6 convergent crustal consumption zones (Ertix-Xar Moron, South Tianshan, Kuanping-Foziling, Bangonghu-Shuanghu-Nujiang-Changning-Menglian, Brahmaputra, Jiangshao-Chenzhou-Qinfang) have been subdivided. Correspondingly, the strata of the continent of China are subdivided into 17 tectonic-strata superregions which tectonically belong to 3 blocks or platforms, 6 convergent crustal consumption zones and 8 orogenic series. This division is mainly based on 9 key aspects, including the difference of tectonic environment and tectonic evolution among blocks, convergent crustal consumption zones and orogenic belts, the timing when the oceanic crusts transferring into continental crusts, the feature of paleobiogeograph and the types of strata, etc.. ©, 2015, China University of Geosciences. All right reserved.

Wei Y.,Wuhan Institute of Geology and Minerals Resources | Peng S.,Wuhan University | Peng S.,China Three Gorges University | Jiang X.,Wuhan University | And 5 more authors.
Journal of Earth Science | Year: 2012

SHRIMP zircon U-Pb dating of the Neoproterozoic Maoping ((Chinese Source)) series (Sandouping ((Chinese Source)) rock suite) granites exposed in the southern part of the Huangling ((Chinese Source)) anticline shows that the formation time of Sandouping biotite-hornblende tonalite intrusion, Jinpansi ((Chinese Source)) hornblende-biotite tonalite intrusion, and Longtanping ((Chinese Source)) monzogranite are 863±9, 842±10, and 844±10 Ma, respectively. Their geochemical features include A/CNK=0. 98-1. 06, from metaluminous to weakly peraluminous, δ=1. 37-1. 53, Sm/Nd=0. 17-0. 24, and Rb N/Yb N=1. 1-3. 62. These indicate that the granite rocks are supersaturated SiO 2 calc-alkaline granitoids. The characteristic of Sr-Nd isotopic composition is that the values of e{open} Nd(t) and e{open} Sr(t) are -12. 4 to -11. 0 and 20. 2-32. 2, respectively. It also suggests that the material source of the granite rocks mainly originated from the crust, and they formed in a volcanic arc tectonic environment. These facts suggest that the occurrence of Neoproterozoic granitoids in the southern part of the Huangling anticline should be related to an arc environment along an active continental margin caused by southward subduction of oceanic crust beneath the northern Yangtze craton, and the formation age is not later than 863 Ma. © 2012 China University of Geosciences and Springer-Verlag Berlin Heidelberg.

Wang S.F.,Wuhan Institute of Geology and Minerals Resources | Fu Y.P.,Wuhan Institute of Geology and Minerals Resources | Zhao X.,Wuhan Institute of Geology and Minerals Resources
Applied Mechanics and Materials | Year: 2012

In recent years, micro-pile has been widely applied to landslide treatment engineering due to its advantages in application and construction, and the engineering effect is very evident. Large-scale physical model test was made for studying failure mode of micro-pile group in landslide, which indicated that numerical magnitudes between the displacement and the stress of the piles are better consistent along the load transfer direction. Concentrated destruction points locate on about three times the pile diameter up and down the slip surface. Failure mode of micro-pile in landslide treatment engineering is: pile of the loaded segment usually breaks for bending moment and shear force, and back of sliding side mainly exposes to the tension role, compared to role of tension of anchored segment in front of the micro-piles and compression behind of the piles. © (2012) Trans Tech Publications, Switzerland.

Yang X.-L.,Wuhan Institute of Geology and Minerals Resources | Cui S.,Wuhan Institute of Geology and Minerals Resources | Yang M.,Wuhan Institute of Geology and Minerals Resources | Li X.-D.,Wuhan Institute of Geology and Minerals Resources
Yejin Fenxi/Metallurgical Analysis | Year: 2011

The polymetallic ore samples were treated by alkali fusion-ion exchange and the rare earth elements in the samples were determined by inductively coupled plasma mass spectrometry (ICP-MS). The instrument operating parameters were optimized, and the factors affecting the analytical results including ion exchange speed and eluant were discussed. Experiment results indicated that the matrix interferences and mass interferences could be eliminated by ion exchange separation and selecting appropriate analytical isotopes, and analytical signal drift could be inhibited with Rh, Re as internal standard elements. The method has been used for the determination of rare earth elements in polymetallic ore certified reference materials which mainly contained zinc ore and copper ore respectively (GBW07237, GBW07233). The results were in good agreement with the certified values. Detection limits of the method were in the range of 0.001-0.009 μg/g with relative standard deviations of 1.3%-7.8% and recoveries of 91%-109%.

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